the python-only web framework · 2015. 12. 23. · access control i18n accessability graceful...
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EuroPython 2015
the Python-only web frameworkIwan Vosloo
EuroPython 2015
15 Python
Financial industry / in-house development
10
About
zope
8026 600 loc(40% tests)
EuroPython 2015
● Background● What it is● How it works● Why you should care● Strategy● Status● Questions
the Python-only web framework
EuroPython 2015
Background
Web frameworks
def func(code code co) code code code code code
code
GET /some/urlmap url to some code
1
HTMLTemplate
<html> <body> </body></html>
2read from a database
3merge data with template
4respond final HTML
EuroPython 2015
Background
Web frameworks
def func(code code co)
re-use templates css frameworks js libraries
EuroPython 2015
Background
Technology focus
HTTP (routing)
HTML (template language)
Javascript (js libraries)
CSS (other frontend libraries)
EuroPython 2015
What it is
Goal focus
HTTP (routing)
HTML (template language)
Javascript (js libraries)
CSS (other frontend libraries)
Save
Name:
Email:
Add Address
Address BookJohn: john@example.org
View: / View: /add
Button
how
EuroPython 2015
Widget
What it is
Pages are widgets
Save
Name:
Email:
Widget
Widget
EuroPython 2015
What it is
Composing widgets
panel1 = Div(view) panel1.add_child( P(view, text='a paragraph with text') )
Div
a paragraph with text P
EuroPython 2015
What it is
Widgets are not HTML
EuroPython 2015
What it is
Widgets are not HTML
sliding_panel = SlidingPanel(view)
panel1 = sliding_panel.add_panel(Div(view)) panel1.add_child(P(view, text='a paragraph with text'))
panel2 = sliding_panel.add_panel(Div(view)) panel2.add_child(P(view, text='a different paragraph'))
EuroPython 2015
What it is
Widgets are not HTML
EuroPython 2015
How it works
Behind the SlidingPanel
GET /some/url?index=2
HTML (showing second panel)
JS
EuroPython 2015
How it works
Behind the SlidingPanel
HTTP (routing)HTML (template language)
Javascript (js libraries)CSS (other frontend libraries)
Server-side logic
Extra URLs & Query string arguments
SlidingPanel
how
EuroPython 2015
How it works
Widget lifetime
Add Address
Address BookJohn: john@example.org
AddressBookPanel
EuroPython 2015
How it works
Widget lifetime
class AddressBookPanel(Div): def __init__(self, view): super(AddressBookPanel, self).__init__(view)
self.add_child(H(view, 1, text='Address Book')) for address in Session.query(Address).all(): self.add_child(AddressBox(view, address))
EuroPython 2015
How it works
Defining a UserInterface
Save
Name:
Email:
Add Address
Address BookJohn: john@example.org
View: / View: /add
EuroPython 2015
How it works
Defining a UserInterfaceclass AddressBookUI(UserInterface):
def assemble(self):
addresses = self.define_view('/', title='Addresses') addresses.set_page(HomePage.factory())
add = self.define_view('/add', title='Add an address') add.set_page(AddPage.factory())
self.define_transition(Address.events.save, add, addresses)
EuroPython 2015
Why you should care
EuroPython 2015
Why you should care
Knowledge & focus
Widget
TextInput
ValidationConstraint
Event
Action
Field Layout
Button
forget technological details
CheckboxInput
Menu
TabbedPanel
EuroPython 2015
Why you should care
Re-useWidget
TextInputValidationConstraint
Event
Action FieldLayout
Button
i18naccess control accessabilitygraceful degradation
forget technological details
Menu
double submitconcurrency security issues quirks
EuroPython 2015
Why you should care
Complicated requirements
EuroPython 2015
Strategy
“No-html” frameworks
main stream no-html
EuroPython 2015
Strategy
Maintain web semantics
● Tabbed browsing● Bookmarks● Back button● ...
EuroPython 2015
Strategy
Support web ideals
● JavaScript optional● Device independence● Accessibility● ...
EuroPython 2015
Strategy
Web-grown API
JS JS
JS
EuroPython 2015
Strategy
Aim: higher level issues
Save
Name:
Email:
Add Address
Address BookJohn: john@example.org
EuroPython 2015
Strategy
Leverage existing wisdom
EuroPython 2015
Status
Our journey
idealisticimpossible
foundationriskconcrete
more flexibilitybells & whistlesinterest & community
EuroPython 2015
Dream
You’re invited
1. Look at examples2. Join mailing list(s)3. Install4. Follow tutorial5. Help
spread the word
infra-structure
evolvecore
grow up
EuroPython 2015
Thanks
On groups.google.com:● reahl-announce● reahl-discuss
www.reahl.org@reahl
iwan@reahl.org
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